Improvement in sewing-machines



2 Sheetsheeu 2. J. N. MCLEAN.

. SEWING MACHINE.

No. 105,961. 'Paftented.Aug 2, 1870.

lo autonom 'it may concern: l Beit known that I, JonN'N. MoLEAm'of the city :and countyof Philadelphia, in the chinery; and l do hereby declare that the foly cation, in which`V 4 'the improved machine complete,-showing a l hemmer attached to the bed. Fig. 2,'Plate l, isa view ofthe bottom side of the bed-plate,

`and its pressure-'pad depressed. Fig. 6, Plate l iirstinaconvex riding swell for theneedle` ond, inthe combination, substantially as hereinafter specied,fof a tubular orf'sleeve press# UNIT-En STATES" PATENT OFFICE.

y JOHN N. MCLEAN, on'PHiLAnELPHIm PENNsrLvANrA.

' IMPR'QVEMENT'IN-sEwINe-MACHINES.

` i Specification forming part of Letters Patent No. l 05,961, dated August 2, 1870.

State of Pennsylvania, have invented certain new and'useful Improvements `in Sewing Malow-ing is a ef1`ill,. clear, and exact'description thereof, reference being` had to the accompanyingdrawings,,mak-inge part of this speci- Figure l, Plate, l, isi-a perspective view of showing the mechanism for operating -the looper. Fig. 3, Plate 1,-isa perspective view of a hemmer applied to a dovetailv base. Fig'. 4, Plate 2, vis a fron-t View of the upper portion of the machine and; a section taken transversely and' lvertically through thebed-plate, indicating theneedle-barand its Vpressure-pad ele-l vated. Fig.` 5, Plate 2, shows the `needle-bar 2,sa vertical-section through Fig. 4. Fi g'.- 7 is alfbottom view'of theimechanism beneath the lo'edfplata` Fig; 8 shows the camwhich actuates the looper mechanism. l VSimilariletters of ,reference indicate correspondin g parts-Yin the several figures.

lThis inventionrelates mainly to. thatzclass of sewing` machinery 'in which the stitches'are formedby the interlacement of two separateV threadszltalren. directly from the spools or bob-l bins of commerce; 4and myinvention consists,

thread, which swellgis formed -or applied on one edgeof .theface-plate, betweenl agn'idin geye on the needle-'bar and acorrespon'ding eye on the frameof the machine, sothat the thread will be taken up and the tensional stra-in applied at the proper tines in the formation of the Y stitches, aswill behereinafter explained; secer-pad, witha needlebar,`whicl has a vibrating or escillaptingtmotion in-"a vertical plane,- and alsoa. similar motion lateral thereto, the combination being such lthat the presser-pad periodically acts independently of them'otion ot' the needle-bar notwithstandingv it. is fitted around the same; `but at all other times said pad Works in concert with it and makes all the motions that the needle-bar does, as willvbe' bed-plate by means of a link interposed be-v tween the looper-carrier and a vibrating lever,

Vwhich is actuated by a camou the' drivingshaft, said link-being slotted and guided bya stud-in such amanner as to transmit Va coinpound motion to the looper-carrier and afford' greataccuracy and freedom-ot' action to the movements of the looper, as will be hereinafter explained.

Toenable others` skilled in the art to understand 'myinventiom I will explain its construe* tion and operation. n

A represents the bed-plate otthe machine,

and B overhauging fra-meier bracket, carrying.

ou one end the vertical face-plateH,and having applied toit, in suitable bearings, the horizontal driving-shaft'l). Dl is a cam-pulley, over which the drivingbelt passes and into the face of which an eccentric cam-groove,'d,' is formed, of an elliptical form, as-showu in `liixgz. n In the groove d works the anti-friction vWristpin E of a vibrating lever, E, which latter has its fulcrum at c andl passes down througha slot made through the bed-plate and is connected to-one'end of a slotted link beneath such' 'plate, as will be hereinafter-explained.

On the end of shaft D opposite that carrying the cam D' a crank, f, isl applied,- Whose outersurface is flush with the corresponding 'j-surface of thel vertical-faceplate H, as shown nfiig. Eccentrieally to this plate f the `lower endof a pitman', g, is'pivoted. The up- .perportiom g', is slotted and'connected, by a 4fulcru m-pin, t', and set-screw i, to the face-plate H. The pin i is passed through ythe slotted portion y and plays up and down in the vertical'slot kinthe upper portion ofthe faceplate.l By loosening the set-screw or thumbnut t" the length of vibrating stroke or feedl given to. the needle-har can be. regulated. s

The upper end of the needle-bar Fis piv- .oted at'j to the pitman g, andguidcd beneath this pointby an oscillating guide, N.

'Io'the loweror-needle end ofthe needle-bar F is fitted a tubular sleeve, G,Whichplays up and down through the oscillating-guide N,and which is constructed `with a serrated pad, G', on its lower open end, through the 'center otl which isa perforation or slot through which the -needle u passes when in place in the lower Y end of .the needle-bar, as shown in the dlawings.

Around the needle-bar is coiled a spring, s, which is compressed between a shoulder there on and the upper end ot' .the tubular' sleeve, which is slotted vertically at t and receives through this slot apin on the needle-bar. The 'pinprevents the sleeve from turning, and the slot t allows it vertical play on the needle-bar.

During the descending stroke of the needlebar the pad G will be brought to act upon the material being sewed and to press upon it with a yielding pressure, which will be continued during the latter part of they descending stroke and the beginning ofthe ascending stroke of the needle-bar. The needle-bar is caused to vibrate, so as to at'orda needle-feed, the feed and the pad G' also to act to assist `the needle.

y tion, to wit: it assists the needle in feeding the work, and it also holds down the work during part of the ascending stroke ofthe needle. By reference to Figs. 1, 4, and 5, it will be I' seen that one edgeot the face-plateHis curved so as to form a convexity or swell, l, which l shall term the riding swell,7 for the needlethread. The needle-thread is carried from the bobbin b through an eye, b,which is so placed relatively to the eye c on the needle-bar F that the threadwill decline toward this bar at an angle of about one hundred and fifty degrecs. The 'riding-swell Z, which is between the two eyes b and *11,is so arranged relatively to the eye v that, when the needle-bar is fully raised the thread will cross the edge of plate H at the commencement of the swell l, and

`when the needle-bar has descended far enough to carry theeye of the needle through the work the thread will cross the swell at its highest part, after which, as the needle further descends, the thread is eased oft' in such manner as to accommodate the strain on the thread taken up in formingastitch. By this arrangement, as the needle-bar descends from its highest point'the thread is drawn backward through the eye t and the eye ofthe needle about, say, three-sixteenth of an inch, in consequencefot' the change of angle of t-hc thread, and as the needle-bar continues to descend the thread is still further drawn back by riding upon the swell l, and as the eye of the needle passes through the work the thread will be drawn over the lower receding part ot' the swell, and there let offto supply the stitch bein g formed. By this means the thread will be controlled in a lhanner'tofprodllce the requisite degree of tension and take-up to the proper formation 4of thestitches.

The `lower extremity of the vibrating lever E enters a hole made through one end ot' the link J, so that during the operation ofthe machine a lateral motion will be transmitted to this link. In Fig. 7 I have indicated, by the uid of the full and dotted lilies, the compound movements imparted to the loopcr L through the medium of said link and a vibrating arm or crank, K. rl`l1e` looper-lever K is -pivoted to the link J at o, and is ,nvoted to the vibrating arm K between tbc ooper and said link. ThelinkJhasan obtuse angularsiot,w,through it, through which is a fixed anti-friction stud, m, which lat-ter serves as the fulcrum and also a guide about which the link is moved.

It will be seen that the vibrating motion ot' lever E will imparta vibrating motion to thc link J. At the same time the stud m and slot w will cause the link to move forward and backward bodily, thus giving a combined vibrating and endwise motion to the louper-lever and looper. The arm K affords a movable or accommodating fulcruin tothe louper-lever K.

In Figs. l and 3,1) represents a hat plate with a thumb-notch in its surface near one end, y

and with its side edges beveled, so as tomake what is known as a dovetail slide. This slidehas fastened toit, in anysuitable manner, a

hemmer; but instead of this hemmer a feller or any other clothguide or device necessary to be used to assist in controlling the work may be fastened to plate p. The surface ofthe bedplate A is cnt out at p', so as to form adovetai'l groove adapted to receive and hold down in place the slide p.

` Having described myinventiolnwhatlclaim as new, and desire to secure by Letters Patent, is-

1. A convex riding-swell arranged between the guiding-eyes b n, so as to operate on the thread substantially as described.

2. The arrangement within a pivqted oscillating or vibrating guide ofthe tubular sleevepresscr G and needle-bar when operating to feed the material being sewed, substantially as described.-

3. The slotted link J, interposed between the lever E and the louper-lever K, and adapted to operate substantially as described.

S'rocK'roN Barns, WM. M. EOOPER. 

